Summer’s career began in 1983 when she in the original cartoon version of Inspector Gadget as the titular character’s niece Penny. Her unique, throaty voice was instantly recognizable, leading to her participation in such cult franchises as The Care Bears and  Star Wars.

Audiences put Summer’s voice to a face when she was cast in A Different World. Summer continued working in voice acting and was featured in The Real Ghostbusters as Chilly Cooper, neighborhood ice-cream woman and innocent love interest of Slimer.

In all, Summer has voiced hundreds of animated characters, including  (1990) as Elmyra Duff in Tiny Toon Adventures, Susie Carmichael in Rugrats, Cleo the Poodle in Clifford the Big Red Dog, Foxxy Love in Drawn Together, Dulcy the dragon in Sonic the Hedgehog, Princess ‘Kida’ Kidagakash for Disney’s Atlantis: The Lost Empire, Valerie Gray in Danny Phantom (2004), and Numbuh 5  in Codename: Kids Next DoorShe is also the voice of the Green spokescandy for M&M’s.

For video games, she provided voiceovers for Baldur’s Gate: Dark Alliance and BLACK. She voiced Tandi in Fallout and was also the voice of Tatjana in Arc the Lad: Twilight of the Spirits; Lady Belgemine, Young Tidus and additional voice-overs in Final Fantasy X; Lenne/Calli in Final Fantasy X-2; Storm in Marvel Super Hero Squad; Cynder in The Legend of Spyro: A New Beginning and Magma in X-Men Legends, and the voice of Catalina Thorn, the leader of the Cell in Crackdown 2. She also had a small role in Mass Effect. She also voices Medusa in the game Kid Icarus: Uprising for the Nintendo 3DS. She also voiced the Inca priness Micay in Pitfall: The Lost Expedition. She also did miscellaneous voices in World of Warcraft: Mists of Pandaria.

Summer sang since an early age and joined her first band at 13.  In 1990, she sang background vocals on two tracks for fellow A Different World cast member Jasmine Guy‘s self titled LP. In 1999, Summer released her solo album Street Faërie produced by and featuring guest artistLenny Kravitz. She recorded a song titled “Savior Self” for which she directed a music video co-starring Zoe Kravitz, daughter of actress Lisa Bonet and rocker Lenny Kravitz.