Patton Oswalt is no longer just a comedy giant in the figurative sense. The comedian is voicing an unsightly 50-foot-tall human-like alien — call him “Unattractive Giant Monster” — that will wreak havoc all over “Benderama,” an episode of Futurama that airs Thursday night on Comedy Central. (“Benderama” airs at 10:30 p.m. ET/PT, after “Neutopia” kicks off the second part of the animated comedy’s sixth season at 10 p.m.) The 35-word summary: The hot-headed UGM attacks the Futurama crew after Bender insults him. When he returns to apologize, he loses his cool, which ultimately leads to an epic showdown with a supersized Bender.