Taking a break from his day job at 'The Event,' Jason Ritter is returning to 'Parenthood.'

According to TVLine, Ritter will be back for one episode. Lauren Graham's character, Sarah, seeks advice from her former beau, Mark, played by Ritter.

"We're very excited to have him back," Jason Katims, 'Parenthood' executive producer, said. "Sarah comes to him for advice about something. It's only a few scenes, but what's nice about it is you see that they still have this amazing connection. They are great together."

In other casting news ...

• The mayor of Cincinnati will appear on 'Undercover Boss.' Mark Mallory's episode has yet to be scheduled for airing. [WLWT]

• Martha Plimpton is in talks to return to 'The Good Wife.' The 'Raising Hope' star appeared in two episodes last season and may return this spring. [Entertainment Weekly]

• Robin Givens will appear on 'Chuck.' Givens will appear in multiple episodes as an agency head who makes an offer to Casey. 'Supernatural' and 'The Vampire Diaries' actress Lauren Cohan will recur on the series as Vivian, a socialite and daughter of a criminal mastermind. [TVLine]

If you're still jonesing for more shark action after the end of the most recent "Shark Week" on the Discovery Channel, Spike TV might be able to whet (and wet) your appetite with The Hunt For: Monster Sharks, a one-hour special airing September 3 at 10:00 p.m.

The special covers the annual Oak Bluffs Monster Shark Tournament in which over 200 boats and 1,000 fishermen compete to see who can capture the largest shark in the waters off Martha's Vineyard.

Frankly, I find the whole thing cruel. Everybody knows sharks, like people, often vacation in Martha's Vineyard. While there, they don't bother people at all, they just drink wine and play cribbage: