Flea has pursued a minor acting career since the mid-1980s. His first role was as young punk Razzle in the Penelope Spheeris film Suburbia (1984). Shortly thereafter he starred alongside the Chili Peppers, who played themselves, in the skate drama Thrashin' (1986). He played the ill-fated punker Milo in another Penelope Spheeris film, Dudes (1987). He also made an appearance in the Bruce Weber documentary film about the life and career of jazz trumpeter Chet Baker entitled Let's Get Lost (1988). He portrayed the character Douglas J Needles in Back to the Future Part II (1989) and Back to the Future Part III (1990), though in an interview he referred to Part II as "a multi-million dollar piece of trash", saying that he was happy neither with the film nor his performance in it.

Movies in which I appear

s o r t e d   b y   r e l e a s e   y e a r

Suburbia (1983) - as Razzle (billed as Mike B. The Flea)

Thrashin' (1986) - as himself (member of Red Hot Chili Peppers)

Dudes (1987) - as Milo

Less Than Zero (1987) - as Musician No. 1

Stranded (1987) - as Jester the Alien

The Blue Iguana (1988) - as Floyd

Back to the Future Part II (1989) - as Douglas J. Needles

Back to the Future Part III (1990) - as Douglas J. Needles

The Idiot Box Episode #1.2 (1991) - as Mugger

Motorama (1991) - as Busboy

My Own Private Idaho (1991) - as Budd

Roadside Prophets (1992) - as Two Free Stooges

Son in Law (1993) - as Tattoo Artist (uncredited)

The Chase (1994) - as Dale

Just Your Luck (1996) - as Johnny

The Crow: City of Angels (1996)

The Wild Thornberrys (1998–2004) - as Donnie Thornberry (voice)/Tom (voice)/additional voices

The Big Lebowski (1998) - as Nihilist No. 2, Kieffer

Fear and Loathing in Las Vegas (1998) - as Musician

The Lionhearts Episode: Singin' in the Maine (1998) - as voice

Psycho - as Bob Summerfield

Liar's Poker (1999) - as Freddie

Goodbye Casanova (2000) - as Silent

Gen¹³ (2000) - as Grunge (voice)/Edward Chang (voice)

The Wild Thornberrys: The Origin of Donnie (2001) - as Donnie Thornberry (voice)

The Wild Thornberrys Movie (2002) - as Donnie Thornberry (voice)

Rugrats Go Wild (2003) - as Donnie Thornberry (voice)

Low Down (2014) - as Hobbs (also as executive producer on the film)

Sheriff Callie's Wild West (2014) - as Milk Bandit

you can check out trailers on imdb.com, you may find something interesting