Callen puts the “G.” in “OMG” when NCIS: Los Angeles opens Season 7, as seen in these exclusive photos from the CBS drama’s Monday, Sept. 21 premiere.

Picking up three months after the finale, in which Hetty (played by Linda Hunt) informed/fibbed to Callen (Chris O’Donnell) that his father was dead, “We discover that Callen has been doing his own investigation into something,” showrunner Shane Brennan tells TVLine. And as a result of his rogue op, “He finds himself in a very difficult situation with Hetty and Sam (LL Cool J), because he’s not telling them what he’s got himself caught up in.”

Read the whole article and see more teaser pictures on tvline.com.

NCIS: Los Angeles starring Chris O’Donnell, LL Cool J, Linda Hunt, Daniela Ruah, Barrett Foa, Eric Christian Olsen, Renée Felice Smith and Miguel Ferrer will be back on on CBS Monday September 21st @10pm.