Dynarski has also appeared in numerous television shows. He is one of 32 actors or actresses to have guest-starred in both the original Star Trek television series (episodes "Mudd's Women" and "The Mark of Gideon") and in one of the series' spin offs (Star Trek: The Next Generation's "11001001"). In Monkees TV series, Dynarski played the Dragonman's sidekick, Toto, in the episode titled "Monkee Chow Mein" (original US air date: March 13, 1967). His many other TV credits include episodes of Batman (episodes 47 and 48), Starsky & Hutch, CHiPs, Little House on the Prairie and The A-Team. He is also known for his two appearances as Izzy Mandelbaum Jr. on Seinfeld. Dynarski appeared in the short Apple Jack (2003) as Helmut Jitters.

In 1971's Duel, Dynarski had a small role as a truck driver in a cafe. In Command & Conquer: Red Alert, Dynarski plays a major supporting role as Soviet Premier Joseph Stalin, appearing throughout much of the game's Soviet campaign and, to a lesser extent, the Allied campaign. In the 1974 film Earthquake, Dynarski portrays Fred, a worker at the Mulholland Dam who becomes the first fatality of the disaster.