  In the paper we introduce a notion of the Bruck-Reilly $\lambda$-polycyclic
extension of a monoid $S$ with a homomorphism $\theta$ which is an analogue of
the Bruck-Reilly extension of a monoid $S$. We describe idempotens of the
semigroup $\left(\mathscr{P}_{\lambda}(\theta,S),*\right)$ and Green's
relations on $\left(\mathscr{P}_{\lambda}(\theta,S),*\right)$. It is proved
that $\left(\mathscr{P}_{\lambda}(\theta,S),*\right)$ is a $0$-simple semigroup
for any semigroup $S$. We find necessary and sufficient conditions on a monoid
$S$ and a homomorphism $\theta$ under which the semigroup
$\left(\mathscr{P}_{\lambda}(\theta,S),*\right)$ is regular, inverse,
$0$-bisimple, combinatorial, congruence free, or inverse 0-E-unitary. Also we
study topologizations of the semigroup
$\left(\mathscr{P}_{\lambda}(\theta,S),*\right)$.
